lib/Target/PowerPC/PPCTargetMachine.cpp

   1 //===-- PPCTargetMachine.cpp - Define TargetMachine for PowerPC -----------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // Top-level implementation for the PowerPC target.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "PPC.h"
  15 #include "PPCTargetMachine.h"
  16 #include "llvm/PassManager.h"
  17 #include "llvm/MC/MCStreamer.h"
  18 #include "llvm/Target/TargetOptions.h"
  19 #include "llvm/Support/FormattedStream.h"
  20 #include "llvm/Support/TargetRegistry.h"
  21 using namespace llvm;
  22
  23 extern "C" void LLVMInitializePowerPCTarget() {
  24   // Register the targets
  25   RegisterTargetMachine<PPC32TargetMachine> A(ThePPC32Target);
  26   RegisterTargetMachine<PPC64TargetMachine> B(ThePPC64Target);
  27 }
  28
  29 PPCTargetMachine::PPCTargetMachine(const Target &T, StringRef TT,
  30                                    StringRef CPU, StringRef FS,
  31                                    const TargetOptions &Options,
  32                                    Reloc::Model RM, CodeModel::Model CM,
  33                                    CodeGenOpt::Level OL,
  34                                    bool is64Bit)
  35   : LLVMTargetMachine(T, TT, CPU, FS, Options, RM, CM, OL),
  36     Subtarget(TT, CPU, FS, is64Bit),
  37     DataLayout(Subtarget.getTargetDataString()), InstrInfo(*this),
  38     FrameLowering(Subtarget), JITInfo(*this, is64Bit),
  39     TLInfo(*this), TSInfo(*this),
  40     InstrItins(Subtarget.getInstrItineraryData()) {
  41 }
  42
  43 /// Override this for PowerPC.  Tail merging happily breaks up instruction issue
  44 /// groups, which typically degrades performance.
  45 bool PPCTargetMachine::getEnableTailMergeDefault() const { return false; }
  46
  47 void PPC32TargetMachine::anchor() { }
  48
  49 PPC32TargetMachine::PPC32TargetMachine(const Target &T, StringRef TT,
  50                                        StringRef CPU, StringRef FS,
  51                                        const TargetOptions &Options,
  52                                        Reloc::Model RM, CodeModel::Model CM,
  53                                        CodeGenOpt::Level OL)
  54   : PPCTargetMachine(T, TT, CPU, FS, Options, RM, CM, OL, false) {
  55 }
  56
  57 void PPC64TargetMachine::anchor() { }
  58
  59 PPC64TargetMachine::PPC64TargetMachine(const Target &T, StringRef TT,
  60                                        StringRef CPU,  StringRef FS,
  61                                        const TargetOptions &Options,
  62                                        Reloc::Model RM, CodeModel::Model CM,
  63                                        CodeGenOpt::Level OL)
  64   : PPCTargetMachine(T, TT, CPU, FS, Options, RM, CM, OL, true) {
  65 }
  66
  67
  68 //===----------------------------------------------------------------------===//
  69 // Pass Pipeline Configuration
  70 //===----------------------------------------------------------------------===//
  71
  72 bool PPCTargetMachine::addInstSelector(PassManagerBase &PM) {
  73   // Install an instruction selector.
  74   PM.add(createPPCISelDag(*this));
  75   return false;
  76 }
  77
  78 bool PPCTargetMachine::addPreEmitPass(PassManagerBase &PM) {
  79   // Must run branch selection immediately preceding the asm printer.
  80   PM.add(createPPCBranchSelectionPass());
  81   return false;
  82 }
  83
  84 bool PPCTargetMachine::addCodeEmitter(PassManagerBase &PM,
  85                                       JITCodeEmitter &JCE) {
  86   // FIXME: This should be moved to TargetJITInfo!!
  87   if (Subtarget.isPPC64())
  88     // Temporary workaround for the inability of PPC64 JIT to handle jump
  89     // tables.
  90     Options.DisableJumpTables = true;
  91
  92   // Inform the subtarget that we are in JIT mode.  FIXME: does this break macho
  93   // writing?
  94   Subtarget.SetJITMode();
  95
  96   // Machine code emitter pass for PowerPC.
  97   PM.add(createPPCJITCodeEmitterPass(*this, JCE));
  98
  99   return false;
 100 }